drivers/acpi/acpica/tbxfload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfload - Table load/unload external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2014, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "actables.h"
  50
  51 #define _COMPONENT          ACPI_TABLES
  52 ACPI_MODULE_NAME("tbxfload")
  53
  54 /* Local prototypes */
  55 static acpi_status acpi_tb_load_namespace(void);
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_load_tables
  60  *
  61  * PARAMETERS:  None
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  66  *
  67  ******************************************************************************/
  68
  69 acpi_status __init acpi_load_tables(void)
  70 {
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE(acpi_load_tables);
  74
  75         /* Load the namespace from the tables */
  76
  77         status = acpi_tb_load_namespace();
  78         if (ACPI_FAILURE(status)) {
  79                 ACPI_EXCEPTION((AE_INFO, status,
  80                                 "While loading namespace from ACPI tables"));
  81         }
  82
  83         return_ACPI_STATUS(status);
  84 }
  85
  86 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
  87
  88 /*******************************************************************************
  89  *
  90  * FUNCTION:    acpi_tb_load_namespace
  91  *
  92  * PARAMETERS:  None
  93  *
  94  * RETURN:      Status
  95  *
  96  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
  97  *              the RSDT/XSDT.
  98  *
  99  ******************************************************************************/
 100 static acpi_status acpi_tb_load_namespace(void)
 101 {
 102         acpi_status status;
 103         u32 i;
 104         struct acpi_table_header *new_dsdt;
 105
 106         ACPI_FUNCTION_TRACE(tb_load_namespace);
 107
 108         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 109
 110         /*
 111          * Load the namespace. The DSDT is required, but any SSDT and
 112          * PSDT tables are optional. Verify the DSDT.
 113          */
 114         if (!acpi_gbl_root_table_list.current_table_count ||
 115             !ACPI_COMPARE_NAME(&
 116                                (acpi_gbl_root_table_list.
 117                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 118                                ACPI_SIG_DSDT)
 119             ||
 120             ACPI_FAILURE(acpi_tb_validate_table
 121                          (&acpi_gbl_root_table_list.
 122                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 123                 status = AE_NO_ACPI_TABLES;
 124                 goto unlock_and_exit;
 125         }
 126
 127         /*
 128          * Save the DSDT pointer for simple access. This is the mapped memory
 129          * address. We must take care here because the address of the .Tables
 130          * array can change dynamically as tables are loaded at run-time. Note:
 131          * .Pointer field is not validated until after call to acpi_tb_validate_table.
 132          */
 133         acpi_gbl_DSDT =
 134             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
 135
 136         /*
 137          * Optionally copy the entire DSDT to local memory (instead of simply
 138          * mapping it.) There are some BIOSs that corrupt or replace the original
 139          * DSDT, creating the need for this option. Default is FALSE, do not copy
 140          * the DSDT.
 141          */
 142         if (acpi_gbl_copy_dsdt_locally) {
 143                 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
 144                 if (new_dsdt) {
 145                         acpi_gbl_DSDT = new_dsdt;
 146                 }
 147         }
 148
 149         /*
 150          * Save the original DSDT header for detection of table corruption
 151          * and/or replacement of the DSDT from outside the OS.
 152          */
 153         ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 154                     sizeof(struct acpi_table_header));
 155
 156         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 157
 158         /* Load and parse tables */
 159
 160         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 161         if (ACPI_FAILURE(status)) {
 162                 return_ACPI_STATUS(status);
 163         }
 164
 165         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 166
 167         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 168         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 169                 if ((!ACPI_COMPARE_NAME
 170                      (&(acpi_gbl_root_table_list.tables[i].signature),
 171                       ACPI_SIG_SSDT)
 172                      &&
 173                      !ACPI_COMPARE_NAME(&
 174                                         (acpi_gbl_root_table_list.tables[i].
 175                                          signature), ACPI_SIG_PSDT))
 176                     ||
 177                     ACPI_FAILURE(acpi_tb_validate_table
 178                                  (&acpi_gbl_root_table_list.tables[i]))) {
 179                         continue;
 180                 }
 181
 182                 /*
 183                  * Optionally do not load any SSDTs from the RSDT/XSDT. This can
 184                  * be useful for debugging ACPI problems on some machines.
 185                  */
 186                 if (acpi_gbl_disable_ssdt_table_load) {
 187                         ACPI_INFO((AE_INFO, "Ignoring %4.4s at %p",
 188                                    acpi_gbl_root_table_list.tables[i].signature.
 189                                    ascii, ACPI_CAST_PTR(void,
 190                                                         acpi_gbl_root_table_list.
 191                                                         tables[i].address)));
 192                         continue;
 193                 }
 194
 195                 /* Ignore errors while loading tables, get as many as possible */
 196
 197                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 198                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 199                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 200         }
 201
 202         ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
 203
 204 unlock_and_exit:
 205         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 206         return_ACPI_STATUS(status);
 207 }
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    acpi_load_table
 212  *
 213  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 214  *                                    table to be loaded.
 215  *
 216  * RETURN:      Status
 217  *
 218  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 219  *              be a valid ACPI table with a valid ACPI table header.
 220  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 221  *              Note2: Does not copy the incoming table. User is responsible
 222  *              to ensure that the table is not deleted or unmapped.
 223  *
 224  ******************************************************************************/
 225
 226 acpi_status acpi_load_table(struct acpi_table_header *table)
 227 {
 228         acpi_status status;
 229         u32 table_index;
 230
 231         ACPI_FUNCTION_TRACE(acpi_load_table);
 232
 233         /* Parameter validation */
 234
 235         if (!table) {
 236                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 237         }
 238
 239         /* Must acquire the interpreter lock during this operation */
 240
 241         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 242         if (ACPI_FAILURE(status)) {
 243                 return_ACPI_STATUS(status);
 244         }
 245
 246         /* Install the table and load it into the namespace */
 247
 248         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 249         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 250         status = acpi_tb_install_non_fixed_table(ACPI_PTR_TO_PHYSADDR(table),
 251                                                  ACPI_TABLE_ORIGIN_EXTERN_VIRTUAL,
 252                                                  TRUE, &table_index);
 253         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 254         if (ACPI_FAILURE(status)) {
 255                 goto unlock_and_exit;
 256         }
 257
 258         /*
 259          * Note: Now table is "INSTALLED", it must be validated before
 260          * using.
 261          */
 262         status =
 263             acpi_tb_validate_table(&acpi_gbl_root_table_list.
 264                                    tables[table_index]);
 265         if (ACPI_FAILURE(status)) {
 266                 goto unlock_and_exit;
 267         }
 268
 269         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 270
 271         /* Invoke table handler if present */
 272
 273         if (acpi_gbl_table_handler) {
 274                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 275                                              acpi_gbl_table_handler_context);
 276         }
 277
 278 unlock_and_exit:
 279         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 280         return_ACPI_STATUS(status);
 281 }
 282
 283 ACPI_EXPORT_SYMBOL(acpi_load_table)
 284
 285 /*******************************************************************************
 286  *
 287  * FUNCTION:    acpi_unload_parent_table
 288  *
 289  * PARAMETERS:  object              - Handle to any namespace object owned by
 290  *                                    the table to be unloaded
 291  *
 292  * RETURN:      Status
 293  *
 294  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 295  *              the table and deletes all namespace objects associated with
 296  *              that table. Unloading of the DSDT is not allowed.
 297  *              Note: Mainly intended to support hotplug removal of SSDTs.
 298  *
 299  ******************************************************************************/
 300 acpi_status acpi_unload_parent_table(acpi_handle object)
 301 {
 302         struct acpi_namespace_node *node =
 303             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 304         acpi_status status = AE_NOT_EXIST;
 305         acpi_owner_id owner_id;
 306         u32 i;
 307
 308         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 309
 310         /* Parameter validation */
 311
 312         if (!object) {
 313                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 314         }
 315
 316         /*
 317          * The node owner_id is currently the same as the parent table ID.
 318          * However, this could change in the future.
 319          */
 320         owner_id = node->owner_id;
 321         if (!owner_id) {
 322
 323                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 324
 325                 return_ACPI_STATUS(AE_TYPE);
 326         }
 327
 328         /* Must acquire the interpreter lock during this operation */
 329
 330         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 331         if (ACPI_FAILURE(status)) {
 332                 return_ACPI_STATUS(status);
 333         }
 334
 335         /* Find the table in the global table list */
 336
 337         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 338                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 339                         continue;
 340                 }
 341
 342                 /*
 343                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 344                  * of the DSDT. No other types of tables should get here, since
 345                  * only these types can contain AML and thus are the only types
 346                  * that can create namespace objects.
 347                  */
 348                 if (ACPI_COMPARE_NAME
 349                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 350                      ACPI_SIG_DSDT)) {
 351                         status = AE_TYPE;
 352                         break;
 353                 }
 354
 355                 /* Ensure the table is actually loaded */
 356
 357                 if (!acpi_tb_is_table_loaded(i)) {
 358                         status = AE_NOT_EXIST;
 359                         break;
 360                 }
 361
 362                 /* Invoke table handler if present */
 363
 364                 if (acpi_gbl_table_handler) {
 365                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 366                                                      acpi_gbl_root_table_list.
 367                                                      tables[i].pointer,
 368                                                      acpi_gbl_table_handler_context);
 369                 }
 370
 371                 /*
 372                  * Delete all namespace objects owned by this table. Note that
 373                  * these objects can appear anywhere in the namespace by virtue
 374                  * of the AML "Scope" operator. Thus, we need to track ownership
 375                  * by an ID, not simply a position within the hierarchy.
 376                  */
 377                 status = acpi_tb_delete_namespace_by_owner(i);
 378                 if (ACPI_FAILURE(status)) {
 379                         break;
 380                 }
 381
 382                 status = acpi_tb_release_owner_id(i);
 383                 acpi_tb_set_table_loaded_flag(i, FALSE);
 384                 break;
 385         }
 386
 387         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 388         return_ACPI_STATUS(status);
 389 }
 390
 391 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)